Inductance-coil frame



April 12, 1927. .4

. INVENTOR George A wel' Patented Apr. 12, 1927.

UNITED STATES GEORGE A. TURNER, OF STOCKTON, CALIFORNIA.

INDUCTANCE-COIL FRAME.

Application filed-September 28, 1925. Serial No. 59,007.

This invention ielates to improvements in the structure of induotancecoils of all kinds, with particular reference to that type used inconnection with radio receiving and sending apparatus. This inventionrelates specifically to the coil frame upon which the wires of the coilare wound.

The object of the invention is to produce a coil frame of simple,inexpensive and easily assembled structure and one in connection withwhich there will be a low current loss due to the fact that the contactof the coil wires with the frame will be minimized to a very greatdegree over coil constructions where the wires are wound on `a core orframe of the Well known cylindrical or hard rubber types.

In addition to these objects a further object is to provide such aconstruction as will be extremely rigid and compact and render the coilhighly efficient in operation.

These objects I accomplish by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claims.

In the drawings similar characters of reference indicate correspondingparts in the several views:

Fig. 1 is a perspective view ot the new coil frame showing the windingthereon, wherein the frame is made of two continuous bakelite platesarranged and constructed as will later appear.

Fig. 2 is a similar perspective view showing a modification of thestructure shown in Fig. 1 in that the supports for the winding are madeof bakelite strips suitably set into end clamps.

'Figa 3 is an end section of still another modified form of frameshowing how my improved construction 'can be utilized in making al coilhaving a double winding.

Referring now more particularly to the characters of reference on thedrawings, and with particular reference to the construction shown inFig. 1, the winding frame in this instance consists of two continuousbakelite plates or panels 1 mortised together at right angles at theirmedian lines as at 2. The coil wire 3 is then wound around the spacededges of the plates 1 and provided with suitable terminals 4 and 5 setinto the plates 1 at desired points.

It will be seen that the wire can be very tightly wound around the frameand the tighter Ait is wound the more rigid and compact the coil will beand less apt to have the coil wire become disarranged and shorted thanin other types of coils.

Furthermore by having the wire 3 contact only with the free edges ot theplates 1 this minimizes the contact of the wire with any sur-face andresults in the fact that the coil will have a low current loss when inuse.

The cheapness of materials and ot assembly will be obvious, and also themanufacturing cost will be very little, since in production the coil canbe put together and wound with very slight effort.

In the type of coil shown in Fig. 2, in

are set into the strip clamps and fixed rigidly in connection therewithby small countersinks 9 driven into corresponding Idepressions in thebakelite strips,

In this construction the end clamps would be made out of sheet metal andcut and shaped into position b pressing, and brackets 1() would be strucC out at the center of the clamps for fastening the coil in position foroperation.

The wire 11 would be wound around the strips 6 the same as shown forthewire 3 around the continuous plates, as in Fig. 1, the advantages beingthe same.

In this type of structure shown in Fig. 2, however, the cost of thecoils would be very much less than in the type shown in Fig. 1, sincethe bakelite is the most expensive part of the structure and by usingthe strips instead of the plates the cost of material would be muchreduced.

In Fig. 3 I have shown a. similar end clamp construction to that shownin Fig. 2 showing how the same could be adapted for use when a doublewinding of the coil is desired.

Vhen the coil is made with a double winding instead of the singlebakelite strip 6 I would first put in a set of bakelite strips 12 whichwould project only part way of the length of the strip clamps 13 and thefirst winding 14 would be wound therearound. A second set of bakelitestrips 15 would then be pressed into the strip clamps, and the secondwinding 16 would then be wound therearound. The two windings would besubject to the same advantages claimed in connection with the invention,and at the same time they would be rigidly and compact-ly held andseparated and insulated from each other.

From the foregoing description it will be readily seen that I haveproduced such a device as substantially fullills the objects of theinvent-ion as set forth herein.

lhile this specification sets forth in detail the present and preferredconstruction of the device, still in practice such deviations from suchdetail may be resorted to as do not form a departure from the spirit ofthe invention, as defined by the appended claims.

Having thus described my invention what I claim as new and useful anddesire to secure by Letters Patent is:

l. A coil frame comprising end spiders each having a plurality ofarmsradiatin(1r from a common center, transversely space( and parallelears turned inwardly from the outer ends of the arms, and rigid stri sof insulation material, to form supports or a coil winding and toconnect the spiders, fitted between the ears and extending between thearms of the two spiders.

2. A coil fra-me comprising end spiders, winding supporting elementsextending between the spiders at spaced intervals, and brackets forsupporting the frame in a suspended position struck outwardly from thespiders centrally thereof.

In testimony whereof I aiX my signature.

GEORGE A. TURNER.

